stm32f407 + RTOS+LWIP (CLIENT)

The test procedure.

1. Connect with server_1(set reuseable address), and close.

            (when I set reuseable address, the set error is happened)​

       2.Reconnect with server_1, but connection error has occupied.

=>I wonder why I set reuseable address, the set error has happened?

=>why reconnect is failed?(reuseable address is not set completely?)

=> If reuseable address set is unstable, how do I fix it?

I need your help.